What does hash tag mean on twitter?

you see, im on twitter and just started and I don't get this hash tag business in front of a word... what does it mean?
Asked Oct 25, 2013
People use the hashtag symbol # before a relevant keyword or phrase (no spaces) in their Tweet to categorize those Tweets and help them show more easily in Twitter Search. Clicking on a hashtagged word in any message shows you all other Tweets marked with that keyword.
Answered Apr 07, 2015

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